A104279 - cp's OEIS frontend

A104279 Numbers n such that 2n+1 is prime and 2n-1 is not prime.

n	a(n)
1	1
2	5
3	8
4	11
5	14
6	18
7	20
8	23
9	26
10	29
11	33
12	35
13	39
14	41
15	44
16	48
17	50
18	53
19	56
20	63
21	65
22	68
23	74
24	78
25	81
26	83
27	86
28	89
29	95
30	98
31	105
32	111
33	113
34	116
35	119
36	125
37	128
38	131
39	134
40	138
41	140
42	146
43	153
44	155
45	158
46	165
47	168
48	173
49	176
50	179
51	183
52	186
53	189
54	191
55	194
56	198
57	200
58	204
59	209
60	215

[1, 5, 8, 11, 14, 18, 20, 23, 26, 29, 33, 35, 39, 41, 44, 48, 50, 53, 56, 63, 65, 68, 74, 78, 81, 83, 86, 89, 95, 98, 105, 111, 113, 116, 119, 125, 128, 131, 134, 138, 140, 146, 153, 155, 158, 165, 168, 173, 176, 179, 183, 186, 189, 191, 194, 198, 200, 204, 209, 215]

cp's OEIS Frontend

A104279 Numbers n such that 2n+1 is prime and 2n-1 is not prime.

Table of values

List of values

n	a(n)
1	1
2	5
3	8
4	11
5	14
6	18
7	20
8	23
9	26
10	29
11	33
12	35
13	39
14	41
15	44
16	48
17	50
18	53
19	56
20	63
21	65
22	68
23	74
24	78
25	81
26	83
27	86
28	89
29	95
30	98
31	105
32	111
33	113
34	116
35	119
36	125
37	128
38	131
39	134
40	138
41	140
42	146
43	153
44	155
45	158
46	165
47	168
48	173
49	176
50	179
51	183
52	186
53	189
54	191
55	194
56	198
57	200
58	204
59	209
60	215

n	a(n)
1	1
2	5
3	8
4	11
5	14
6	18
7	20
8	23
9	26
10	29
11	33
12	35
13	39
14	41
15	44
16	48
17	50
18	53
19	56
20	63
21	65
22	68
23	74
24	78
25	81
26	83
27	86
28	89
29	95
30	98
31	105
32	111
33	113
34	116
35	119
36	125
37	128
38	131
39	134
40	138
41	140
42	146
43	153
44	155
45	158
46	165
47	168
48	173
49	176
50	179
51	183
52	186
53	189
54	191
55	194
56	198
57	200
58	204
59	209
60	215

n	a(n)
1	1
2	5
3	8
4	11
5	14
6	18
7	20
8	23
9	26
10	29
11	33
12	35
13	39
14	41
15	44
16	48
17	50
18	53
19	56
20	63
21	65
22	68
23	74
24	78
25	81
26	83
27	86
28	89
29	95
30	98
31	105
32	111
33	113
34	116
35	119
36	125
37	128
38	131
39	134
40	138
41	140
42	146
43	153
44	155
45	158
46	165
47	168
48	173
49	176
50	179
51	183
52	186
53	189
54	191
55	194
56	198
57	200
58	204
59	209
60	215